Add a function to return the device node associated with a
specific opp which will facilitate detailing with custom
properties in client drivers.

Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---
 drivers/opp/of.c       | 20 ++++++++++++++++++++
 include/linux/pm_opp.h |  6 ++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index cb716aa2f44b..5695e7c1d091 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -235,6 +235,26 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, 
struct device *dev,
        return ret;
 }
 
+/**
+ * dev_pm_opp_get_np() - Get the device tree node corresponding to an opp
+ * @opp:       opp for which the node should be returned for
+ *
+ * If applicable return the device tree node for the corresponding opp so that
+ * the client can decode "custom" target specific properties.
+ *
+ * Return: A pointer to the device tree or NULL if it doesn't exist
+ */
+struct device_node *dev_pm_opp_get_np(struct dev_pm_opp *opp)
+{
+       if (IS_ERR_OR_NULL(opp)) {
+               pr_err("%s: Invalid parameters\n", __func__);
+               return NULL;
+       }
+
+       return opp->np;
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_np);
+
 /**
  * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
  *                               entries
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 6c2d2e88f066..a38423137db2 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -308,6 +308,7 @@ int dev_pm_opp_of_cpumask_add_table(const struct cpumask 
*cpumask);
 void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask);
 int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask 
*cpumask);
 struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
+struct device_node *dev_pm_opp_get_np(struct dev_pm_opp *opp);
 #else
 static inline int dev_pm_opp_of_add_table(struct device *dev)
 {
@@ -336,6 +337,11 @@ static inline struct device_node 
*dev_pm_opp_of_get_opp_desc_node(struct device
 {
        return NULL;
 }
+
+static inline struct device_node *dev_pm_opp_get_np(struct dev_pm_opp *opp)
+{
+       return NULL;
+}
 #endif
 
 #endif         /* __LINUX_OPP_H__ */
-- 
2.16.1

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